Democrats had seen Nunn as one of their best hopes to thwart a GOP push for a majority.

Republicans are awaiting an additional Senate victory that could mean a Senate majority next year.

Republican candidates picked up Democratic seats in Colorado, Arkansas, Montana, West Virginia and South Dakota.

Boosted by voter discontent, Republicans are also moving toward a stronger grip on the House.

Republicans have won closely-watched governor's races in Wisconsin and Florida. Scott Walker turned back a stiff challenge in Wisconsin, while Gov. Rick Scott in Florida defeated former Republican Gov. Charlie Crist.

But in California, Gov. Jerry Brown has been elected to an unprecedented fourth term.

(Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)

PREVIOUS STORY: GOP member David Perdue is running for U.S. Senate in Georgia against Democratic contender Michelle Nunn. This is one of the races that could swing the power in the U.S. Senate.

It's a very hot race with an interesting rivalry between the two candidates. Both come from families with a long history in politics.

Democrat Michelle Nunn is trying to follow in her father's footsteps, daughter of former democrat senator Sam Nunn.

David Perdue is the cousin of former Georgia governor Sonny Perdue.

Early polls showed Perdue with 48 percent of the vote and Nunn with 45.

If neither candidate gets 50 percent of vote, that could trigger a January 6 runoff. For DECISION 2014: Complete Election Results click here.